A beam of red light and a beam of violet light each deliver the same power on a surface. For which beam is the number of photons hitting the surface per second the greatest?
A) the red beam
B) the violet beam
C) It is the same for both beams.
Answer: A
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Space-based telescopes carrying long-wavelength infrared detectors must carry coolant such as liquid helium to chill their optics to near absolute zero temperature
a. True b. False Indicate whether the statement is true or false
Which layer of the Sun do we see with our eyes?
A) photosphere B) corona C) chromosphere D) convection zone E) radiation zone
Which of the following statements about circumpolar stars is true at all latitudes?
A) They are the stars close to the north celestial pole.
B) They always remain above your horizon.
C) They make relatively small circles, traveling clockwise around the north celestial pole.
D) Like all other stars, they rise in the east and set in the west.
E) You cannot see them from the Southern Hemisphere.
Which wave has the greatest period of oscillation?
1) Wave I 2) Wave II 3) Wave III 4) Wave IV If the waves have the same frequency, which is going by with the greatest speed? 5) Wave I 6) Wave II 7) Wave III 8) Wave IV 9) all have the same speed